If I understand correctly, Garmin devices export GPX (and other standard formats) which contain lists of points, which are GPS pairs. I have lots of scanned negatives, meaning they have no timestamp (or not fine-grained timestamp) data. I can physically visit many of these locations and record waypoints on a hand-held device. Now, the Garmin unit lets me export these data into Basecamp, where I can "geotag" JPEGs, which is fine, except that the Basecamp app does not modify the JPEG ... I see why they might not modify files.
But, this leaves me with two options: either type these data into the Set GPS dialogue in PM or write some Python script to extract these data from the Garden GPX file(s), and then use the ExifTool to write these data into each JPEG, etc.
I am pretty sure that many people on this forum have a better idea of how to get these data in a format the satisfies the PM dialogue ... or, at least I thought it'd be a good idea to see before likely doing more work than needed.
Any ideas (links, etc.) would be appreciated--I don't expect anyone to spend lots of time on this.
Thanks,
Tom R